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* refactor(main): move first-run setup into an assembly * refactor(main): move playback and subtitle pipeline state into an assembly Moves the mpv runtime composer wiring together with the subtitle processing, prefetch, sidebar playback-state, seek-intent, secondary-subtitle and autoplay-priming state it mutates into createPlaybackAssembly. Replaces the main-wiring regex tests for the moved code with behaviour tests that drive real mpv events through a fake client. * refactor(main): move overlay windows and visibility into an assembly * refactor(main): read Electron screen lazily in the overlay assembly deps * docs: describe overlay, playback, and first-run setup assemblies * test(playback): clear scheduled prefetch refresh in warm-tokenization tests
54 lines
2.5 KiB
Markdown
54 lines
2.5 KiB
Markdown
<!-- read_when: writing, reviewing, or deleting tests -->
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# Testing Guidelines
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Status: active
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Last verified: 2026-10-04
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Owner: Kyle Yasuda
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Read when: adding or changing tests
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Which lanes to run lives in [Verification](./verification.md). This page covers what a
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good test looks like here.
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## Test Behavior, Not Wiring
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- Exercise a module through its public interface and assert outcomes: return values,
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resulting state, files written, rows in sqlite, messages sent to a fake process.
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- Prefer real collaborators that are cheap: tmp dirs, in-memory or tmp sqlite, fake
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executables, pure parsers. Fake only the edges (Electron, mpv socket, network).
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- Assert call order only when order is the behavior (startup sequencing, ABA races),
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and then assert relative order, not the whole call log.
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## Do Not Write
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- Pass-through tests: a handler or adapter that only forwards deps
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(`*-runtime-handlers.ts`) needs no test. TypeScript already checks the shape.
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- Source-text tests: reading `.ts`, `.css`, `.html`, `.lua`, `.swift`, or workflow YAML
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and asserting with regexes. If the invariant matters, extract the logic and run it
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(see `src/preload-ipc-listeners.ts`). Policy lints over workflow YAML are the
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exception and belong in one parsed-YAML check.
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- "Stays deleted" tests for removed modules, flags, or selectors. `tsc` and review
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catch reintroduction.
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- Tests that restate constants, defaults, labels, or window options.
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- The same rule at several layers. Test a rule once where it lives; keep one
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end-to-end case (for the tokenizer, the golden corpus) for integration.
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## Keep Tests Small
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- Shared setup goes in a `makeDeps(overrides)` helper or a `*-test-harness.ts` file, not
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pasted into every test.
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- Near-identical cases become a table: `for (const c of cases) test(c.name, ...)`.
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- Inject timers, clocks, and loggers instead of patching globals or private members.
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- A bug fix gets a regression test for the behavior that broke, named after the
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behavior, not the ticket.
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## Known Debt
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- `src/main/main-wiring.test.ts` and `src/renderer/renderer-init-order.test.ts` still
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regex `main.ts` / `renderer.ts` to guard startup ordering. Replace each test with a
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behavioral one as the logic moves out of `main.ts` closures.
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- `src/main/runtime/overlay-geometry-runtime.ts` and
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`src/main/runtime/visible-overlay-interaction-runtime.ts` value-import Electron, so they
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cannot load under `bun test` and stay outside `src/main/assemblies/overlay.ts`. Inject
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`screen`/`dialog` to make them testable and movable.
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